/*
 * @lc app=leetcode.cn id=83 lang=java
 *
 * [83] 删除排序链表中的重复元素
 */

// @lc code=start

class ListNode {
    int val;
    ListNode next;
    ListNode() {}
    ListNode(int val) { 
        this.val = val; 
    }
    ListNode(int val, ListNode next) { 
        this.val = val; 
        this.next = next; 
    }
}

class Solution {
    public ListNode deleteDuplicates(ListNode head) {
        
        if (head == null) {
            return head;
        }

        ListNode cur = head;

        while (cur.next != null) {
            if (cur.val == cur.next.val ) {
                cur.next = cur.next.next;
            } else {
                cur = cur.next;
            }
        }

        return head;

    }
}
// @lc code=end

